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Retrieval Analysis and Methodologies in Atmospheric Limb Sounding Using the GNSS Radio Occultation Technique PhD Defence by Stig Syndergaard. Content of presentation. The GNSS radio occultation principle Data processing and exemplar results -----------------------------------------------

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    1. Retrieval Analysis and Methodologies in Atmospheric Limb Sounding Using the GNSS Radio Occultation Technique PhD Defence by Stig Syndergaard

    2. Content of presentation • The GNSS radio occultation principle • Data processing and exemplar results • ----------------------------------------------- • Violation of spherical symmetry assumption • Severe weather gradients • Earth’s oblateness • Ionosphere calibration of data • Conclusion and prospects

    3. The GPS constellation • 24 satellites • Six 12 hour orbits • Altitude: 20200 km • Inclination: 55º • Transmit dual frequency signals

    4. Content of presentation • The GNSS radio occultation principle • Data processing and exemplar results • ----------------------------------------------- • Violation of spherical symmetry assumption • Severe weather gradients • Earth’s oblateness • Ionosphere calibration of data • Conclusion and prospects

    5. Content of presentation • The GNSS radio occultation principle • Data processing and exemplar results • ----------------------------------------------- • Violation of spherical symmetry assumption • Severe weather gradients • Earth’s oblateness • Ionosphere calibration of data • Conclusion and prospects

    6. Content of presentation • The GNSS radio occultation principle • Data processing and exemplar results • ----------------------------------------------- • Violation of spherical symmetry assumption • Severe weather gradients • Earth’s oblateness • Ionosphere calibration of data • Conclusion and prospects

    7. Correcting for the Earth’s oblateness

    8. Earth’s oblateness Before correction After correction

    9. Content of presentation • The GNSS radio occultation principle • Data processing and exemplar results • ----------------------------------------------- • Violation of spherical symmetry assumption • Severe weather gradients • Earth’s oblateness • Ionosphere calibration of data • Conclusion and prospects

    10. Model calculation of retrievals of the temperature in the case of a typical day-time, solar maximum ionosphere

    11. GPS/MET occultation no. 259, day 35, 1997

    12. Content of presentation • The GNSS radio occultation principle • Data processing and exemplar results • ----------------------------------------------- • Violation of spherical symmetry assumption • Severe weather gradients • Earth’s oblateness • Ionosphere calibration of data • Conclusion and prospects

    13. 14 days of GPS/MET occultations